Brush holder



n 1940- G. J. BUEROSSE ET AL 2,205,464

BRUSH HOLDER Filed Feb. 27, 1939 2 Sheets-Sheet l- [350m J Eva "055p Alfred .E. fiuemsse June 5, 1940- G. J. BUEROSSE ET AL 2,205,454

BRUSH HOLDER Filed Feb. 27, 1939 2 Sheets-Sheet 2 590F479 J .BUFMEEF A/frm E EUR "055a Patented June 25, 1940 I I UNITED STATES PATENT OFFICE BRUSH HOLDER George J. Buerosse, Beaver Dam, and Alfred E.

Buerosse, Wauwatosa, Wis., assignors of threefourths to said George J. Buerosse and onefourth to said Alfred E. Buerosse Application February 27, 1939, Serial No. 258,778

11 Claims. (Cl. 171-324) This invention relates to brush holders for Referring now particularly to the accompanydynamoelectric machines. ing drawings in which like numerals indicate It is essential in dynamoelectric machines of like parts, the numeral designates a commutathe type wherein brushes, which are usually of tor or collector ring of a dynamoelectric machine 5 carbon, must be held firmly against commutators with which one or more brushes 6 are to be held 6 or collector rings, that the brushes be held in a in engagement. Each brush has its own holder, manner which will insure the continuance of indicated generally by the numeral 1, which is proper contact between the brushes and the roattached to the outer end of a supporting arm 8 tating member, and at the same time allow the adjustably mounted on a suitable part of the 10 brush to float to a certain extent so that it will machine. 10 accommodate itself to the surface of the rotating The holder per se comprises a stationary head member. Brush holders heretofore in use for 9 and a floating brush supporting head [0 relthis purpose have been more or less complicated atively movably connected by a link II and a in design, and generally of such cumbersome and helical spring l2. The stationary head 9 has 16 bulky construction as to preclude their use in a split hub l3 adapted to be clamped to a stud l4 small motors. carried by the arm 8, and two arms I5 and It It is therefore one of the objects of this invenproject in opposite directions from the split head. tion to improve the design and construction of The former is bifurcated to receive one end of brush holders of the character described with the link H, and the latter is bored to receive one 20 a view toward simplifying their construction end of the helical spring 12. The spring l2 fits 20 and reducing their dimensions. this bore snugly so that one end of the spring Another object of this invention is to provide is rigidly connected with the stationary head. a brush holder of the character described hav- The floating head ID has a flat outer face I! ing improved means for gripping the brush against which the brush 6 is clamped by means of per se so as to facilitate changing and adjusting a clamping screw l8 threaded in the closed end 25 the brushes. of a stirrup IS, the side arms of which are pivoted With the above and other objects in view which as at 20 to the head In. At one end, the head will appear as the description proceeds, this in- Ill is bifurcated like the arm 15 of the stationary vention resides in the novel construction, comhead to receive the adjacent end of the link ll, bination and arrangement of parts substantially and at its opposite end, the head Hl is bored to i 30 as hereinafter described, and more particularly snugly receive the spring I2. defined by the appended claims, it being under- The spring l2 has its coils closely wound and stood that such changes in the precise embodiis sufiiciently stiff to resist lateral flexure thereof ment or the herein disclosed invention may be with enough force to yieldingly hold the brush made as come within the scope of the claims. in firm engagement with the commutator when 35 The accompanying drawings illustrate two the p s e adj to fl the p as complete examples of the physical embodiment shown in Figure 1. of the invention constructed in accordance with While this manner of mounting the brush obthe best modes so far devised for the practical tains the desired degree of spring tension, it application of the principles thereof, and in does not preclude the slight motion of the brush which: necessary to permit the same to seat itself prop- Figure l is a side view of a brush holder conerly on the rotating member, such slight mostructed in accordance with this invention, and tion being permitted by virtue of the fact that illustrating the manner in which it is installed the ends of the link ll do not fit tightly between in use; the bifurcated arms of the stationary and float- Figure 2 is a perspective View of the brush ing heads, but have a degree of play. It i t b holder; observed, however, that this degree of play is Figure 3 is a top view thereof; limited, and that the link has a definite guiding Figure 4 is a view similar to Figure 1, illustrataction to guide the motion of the floating head.

5: ing a slightly modified embodiment of the inven- It is also to be observed that the link and the 59 t spring are substantially parallel when the spring Figure 5 is a side view of the brush holder ilv is free, as are also the two heads, so that the lustrated in Figure 4, with its parts in their free assembly constitutes substantially a Darallelopositions; and gram to hold the brush at all times parallel to Figure 6 is a top view thereof. the stationary head.

Attention is also directed to the fact that the novel manner of clamping the brush in place greatly facilitates changing and adjustment of brushes, and that in the event the clamping screw should become slightly loosened, the Wedging action incidental to the spring tension acting through a swinging of the stirrup about its pivotal attachment to the floating head maintains the brush firmly clamped to the floating head.

The embodiment of the invention illustrated in Figures 1, 2 and 3 is particularly adapted .to small motors, and for larger motors, the construction may be altered to that illustrated in Figures 4, 5 and 6.

In this instance, the stationary head is secured to its supporting stud M by means of a set screw 2|, and the arms to which the link H and the spring 12 are attached are directed rearwardly at an angle so as to compact the assembly by bringing the floating brush supporting head closer to the mounting head.

In other respects, this embodiment of the in vention is substantially identical to that described.

From the foregoing description taken in com nection with the accompanying drawings, it will be readily apparent to those skilled in the art that this invention provides a brush holder which is extremely simple in design and construction, and which greatly facilitates the application adjustment of the brushes.

What We claim as our invention is;

1. A brush holder of the character described comprising: a stationary head; floating brush supporting head; a link pivotally connectedto each of said heads to guide the same for relative motion; and a coil spring rigidly connected at its opposite ends to said heads to yieldingly urge the same into predetermined relationship.

2. A brush holder of the character described comprising: a stationary head; a floating brush supporting head; a rigid link pivotally connected at its opposite ends to said heads to guide the heads for relative motion; and a helical spring rigidly connected at its opposite ends to said heads and tending at all times to hold the heads in predetermined relative positions at which the helical spring is straight.

3. A brush holder of the character described comprising: a stationary head; a floating brush supporting head; a substantially rigid pivotal connection between the heads to guide the same for relative motion; and spring means connecting said heads and tending at all times to hold the same in predetermined relative positions.

4. A brush holder of the character described comprising: a stationary head; a floating brush supporting head; a rigid link pivotally connected at its opposite ends to said heads to guide relative motion of the heads; and a. helical spring having its opposite ends fixed to said heads to cooperate with the heads and the link in forming substantially a parallelogram so that upon relative motion of the heads they are retained substantially in parallelism.

5. In a brush holder of the character described: a stationary head; a floating brush supporting head; a link pivotally connected at its opposite ends to said heads; and a helical spring having its opposite ends fixed to theheads at points remote from their pivotal connections with the link so that the heads, link and spring form 2.

" pivotally connected at its opposite end to the brush supporting head; and a helical spring having one end fixed to the opposite arm of the stationary head "and its other end fixed to the fioating brush supporting head at a distance from its pivotal connection with the rigid link.

'7. In a brush holder of the character described: astationary head; a floating brush supporting head; a link joining said heads to guide the same for relative motion; a helical. spring having its opposite ends fixed to the heads and tending to hold the same in relative positions at which the spring is straight; and means for securing a brush to the floating brush supporting head.

8. In a brush holder of the character described: a stationary head; a floating brush supporting head; a link joining said heads to guide the same for relative motion; a helical spring having its opposite ends iixed to the heads and tending to hold the same in relative positions at which the i341 spring is straight; and means for clamping a brush to the floating brush supporting head, said last named means comprising, a stirrup connected to the floating head, and a clamping screw threaded in thestirrup and adapted to clamp a brush against the floating head.

9. In a brush holder of the character described: a stationary head; a floating brush supporting head; means for connecting said heads in a manner allowing relative motion therebetween; including, a helical spring, and a substantially rigid pivotal connection between the heads; a stirrup pivotally connected to the floating head; and a clamping screwv threaded in the stirrup and adapted to clamp a brush against the floating head.

10. In a brush holder of the character de scribed: a stationary head; a floating brush supporting head having a substantially fiat outer face; means inovably connecting said heads including, helical spring fixed at its opposite ends to the heads; and a substantially rigid pivotal connection between the heads; a stirrup having its arms-pivotally joined to the floating head and having its closed'end spaced from the flat face of the floating head to receive a brush therebetwecn; and a clamping screw threaded in the closed end of the stirrup to clamp a brush against the hat face of the floating head.

11. A brush holder of the character described comprising: a stationary head having a hub; spaced arms projecting from the hub and forming a substantially obtuse angle with each other; a floating brush supporting head disposed 

